mirror of https://git.ffmpeg.org/ffmpeg.git
339 lines
10 KiB
C
339 lines
10 KiB
C
/*
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* NuppelVideo decoder
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* Copyright (c) 2006 Reimar Doeffinger
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include "libavutil/bswap.h"
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#include "libavutil/common.h"
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#include "libavutil/lzo.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "dsputil.h"
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#include "rtjpeg.h"
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typedef struct {
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AVFrame pic;
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int codec_frameheader;
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int quality;
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int width, height;
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unsigned int decomp_size;
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unsigned char *decomp_buf;
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uint32_t lq[64], cq[64];
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RTJpegContext rtj;
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DSPContext dsp;
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} NuvContext;
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static const uint8_t fallback_lquant[] = {
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16, 11, 10, 16, 24, 40, 51, 61,
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12, 12, 14, 19, 26, 58, 60, 55,
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14, 13, 16, 24, 40, 57, 69, 56,
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14, 17, 22, 29, 51, 87, 80, 62,
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18, 22, 37, 56, 68, 109, 103, 77,
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24, 35, 55, 64, 81, 104, 113, 92,
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49, 64, 78, 87, 103, 121, 120, 101,
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72, 92, 95, 98, 112, 100, 103, 99
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};
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static const uint8_t fallback_cquant[] = {
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17, 18, 24, 47, 99, 99, 99, 99,
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18, 21, 26, 66, 99, 99, 99, 99,
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24, 26, 56, 99, 99, 99, 99, 99,
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47, 66, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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};
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/**
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* @brief copy frame data from buffer to AVFrame, handling stride.
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* @param f destination AVFrame
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* @param src source buffer, does not use any line-stride
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* @param width width of the video frame
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* @param height height of the video frame
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*/
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static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
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{
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AVPicture pic;
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avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
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av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
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}
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/**
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* @brief extract quantization tables from codec data into our context
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*/
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static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
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int size)
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{
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int i;
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if (size < 2 * 64 * 4) {
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av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
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return AVERROR_INVALIDDATA;
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}
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for (i = 0; i < 64; i++, buf += 4)
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c->lq[i] = AV_RL32(buf);
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for (i = 0; i < 64; i++, buf += 4)
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c->cq[i] = AV_RL32(buf);
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return 0;
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}
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/**
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* @brief set quantization tables from a quality value
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*/
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static void get_quant_quality(NuvContext *c, int quality)
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{
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int i;
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quality = FFMAX(quality, 1);
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for (i = 0; i < 64; i++) {
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c->lq[i] = (fallback_lquant[i] << 7) / quality;
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c->cq[i] = (fallback_cquant[i] << 7) / quality;
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}
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}
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static int codec_reinit(AVCodecContext *avctx, int width, int height,
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int quality)
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{
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NuvContext *c = avctx->priv_data;
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int ret;
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width = FFALIGN(width, 2);
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height = FFALIGN(height, 2);
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if (quality >= 0)
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get_quant_quality(c, quality);
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if (width != c->width || height != c->height) {
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// also reserve space for a possible additional header
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int buf_size = 24 + height * width * 3 / 2 + AV_LZO_OUTPUT_PADDING;
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if (buf_size > INT_MAX/8)
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return -1;
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if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
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return ret;
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avctx->width = c->width = width;
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avctx->height = c->height = height;
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av_fast_malloc(&c->decomp_buf, &c->decomp_size,
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buf_size);
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if (!c->decomp_buf) {
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av_log(avctx, AV_LOG_ERROR,
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"Can't allocate decompression buffer.\n");
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return AVERROR(ENOMEM);
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}
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ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
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c->lq, c->cq);
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return 1;
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} else if (quality != c->quality)
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ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
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c->lq, c->cq);
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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NuvContext *c = avctx->priv_data;
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AVFrame *picture = data;
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int orig_size = buf_size;
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int keyframe;
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int size_change = 0;
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int result;
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enum {
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NUV_UNCOMPRESSED = '0',
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NUV_RTJPEG = '1',
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NUV_RTJPEG_IN_LZO = '2',
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NUV_LZO = '3',
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NUV_BLACK = 'N',
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NUV_COPY_LAST = 'L'
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} comptype;
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if (buf_size < 12) {
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av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
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return AVERROR_INVALIDDATA;
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}
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// codec data (rtjpeg quant tables)
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if (buf[0] == 'D' && buf[1] == 'R') {
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int ret;
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// skip rest of the frameheader.
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buf = &buf[12];
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buf_size -= 12;
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ret = get_quant(avctx, c, buf, buf_size);
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if (ret < 0)
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return ret;
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ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq,
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c->cq);
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return orig_size;
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}
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if (buf_size < 12 || buf[0] != 'V') {
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av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
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return AVERROR_INVALIDDATA;
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}
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comptype = buf[1];
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switch (comptype) {
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case NUV_RTJPEG_IN_LZO:
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case NUV_RTJPEG:
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keyframe = !buf[2];
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break;
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case NUV_COPY_LAST:
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keyframe = 0;
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break;
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default:
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keyframe = 1;
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break;
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}
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retry:
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// skip rest of the frameheader.
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buf = &buf[12];
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buf_size -= 12;
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if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
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int outlen = c->decomp_size - AV_LZO_OUTPUT_PADDING, inlen = buf_size;
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if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
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av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
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buf = c->decomp_buf;
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buf_size = c->decomp_size - AV_LZO_OUTPUT_PADDING - outlen;
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}
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if (c->codec_frameheader) {
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int w, h, q;
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if (buf_size < RTJPEG_HEADER_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
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return AVERROR_INVALIDDATA;
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}
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// There seem to exist two variants of this header: one starts with 'V'
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// and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
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// 1 byte header size (== 12), 1 byte version (== 0)
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if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
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av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
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return AVERROR_INVALIDDATA;
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}
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w = AV_RL16(&buf[6]);
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h = AV_RL16(&buf[8]);
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q = buf[10];
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if ((result = codec_reinit(avctx, w, h, q)) < 0)
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return result;
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if (result) {
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buf = avpkt->data;
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buf_size = avpkt->size;
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size_change = 1;
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goto retry;
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}
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buf = &buf[RTJPEG_HEADER_SIZE];
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buf_size -= RTJPEG_HEADER_SIZE;
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}
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if ((size_change || keyframe) && c->pic.data[0])
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avctx->release_buffer(avctx, &c->pic);
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c->pic.reference = 3;
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c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
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FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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result = avctx->reget_buffer(avctx, &c->pic);
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if (result < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return result;
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}
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c->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
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c->pic.key_frame = keyframe;
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// decompress/copy/whatever data
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switch (comptype) {
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case NUV_LZO:
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case NUV_UNCOMPRESSED: {
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int height = c->height;
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if (buf_size < c->width * height * 3 / 2) {
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av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
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height = buf_size / c->width / 3 * 2;
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}
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if(height > 0)
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copy_frame(&c->pic, buf, c->width, height);
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break;
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}
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case NUV_RTJPEG_IN_LZO:
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case NUV_RTJPEG:
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ff_rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
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break;
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case NUV_BLACK:
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memset(c->pic.data[0], 0, c->width * c->height);
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memset(c->pic.data[1], 128, c->width * c->height / 4);
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memset(c->pic.data[2], 128, c->width * c->height / 4);
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break;
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case NUV_COPY_LAST:
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/* nothing more to do here */
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
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return AVERROR_INVALIDDATA;
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}
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*picture = c->pic;
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*got_frame = 1;
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return orig_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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NuvContext *c = avctx->priv_data;
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int ret;
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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c->pic.data[0] = NULL;
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c->decomp_buf = NULL;
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c->quality = -1;
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c->width = 0;
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c->height = 0;
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c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
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if (avctx->extradata_size)
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get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
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ff_dsputil_init(&c->dsp, avctx);
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if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
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return ret;
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return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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NuvContext *c = avctx->priv_data;
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av_freep(&c->decomp_buf);
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if (c->pic.data[0])
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avctx->release_buffer(avctx, &c->pic);
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return 0;
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}
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AVCodec ff_nuv_decoder = {
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.name = "nuv",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_NUV,
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.priv_data_size = sizeof(NuvContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
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};
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